Planes at Heathrow
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Heathrow third runway 'worse for public health'

13 October 2012 Last updated at 13:39 BST

A third runway at Heathrow would be worse for public health than a completely new airport in the Thames Estuary, according to a study funded by American university MIT.

Academics have analysed how many more people would die early because of the extra pollution generated by each project.

Kevin Keane reports.